BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Margaret Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 109 species recorded across 49 survey years, still active.

109Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2025Span
3Observers

Bird Species Found on Pennsylvania Margaret

Top 40 of 109 species by most recent count. Each links to its species trend.

Species recorded on the Margaret route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
American RobinTurdidae692025-20%1972
Red-eyed VireoVireonidae632025+444%1972
Red-winged BlackbirdIcteridae422025-31%1972
European StarlingSturnidae392025+4%1972
Song SparrowPasserellidae382025+7%1972
House SparrowPasseridae322025-12%1972
Common GrackleIcteridae292025+59%1972
Gray CatbirdMimidae292025+0%1972
Mourning DoveColumbidae252025+462%1972
American CrowCorvidae242025+30%1972
Eastern TowheePasserellidae222025+40%1972
Common YellowthroatParulidae222025+60%1972
OvenbirdParulidae182025+820%1973
Northern CardinalCardinalidae152025+5%1972
Wood ThrushTurdidae142025-43%1972
American GoldfinchFringillidae132025-38%1972
Indigo BuntingCardinalidae122025+89%1972
Blue JayCorvidae112025+186%1972
Field SparrowPasserellidae112025-50%1972
Carolina WrenTroglodytidae112025+250%1974
Tufted TitmouseParidae92025+89%1972
Chipping SparrowPasserellidae82025-63%1972
House FinchFringillidae82025-52%1989
Blue-headed VireoVireonidae82005+700%1992
Barn SwallowHirundinidae72025-13%1972
Yellow WarblerParulidae72025+0%1972
Yellow-throated VireoVireonidae72025+186%1991
Red-bellied WoodpeckerPicidae72025+933%1992
KilldeerCharadriidae62024+17%1972
Cedar WaxwingBombycillidae62025+425%1981
Acadian FlycatcherTyrannidae62025+275%1974
Rock PigeonColumbidae52023+70%1978
Baltimore OrioleIcteridae52025+27%1972
Eastern BluebirdTurdidae42025+22%1989
Black-capped ChickadeeParidae42025+150%1978
Hooded WarblerParulidae42025+367%1982
Orchard OrioleIcteridae42025+400%1997
Downy WoodpeckerPicidae32025+0%1972
Eastern PhoebeTyrannidae32025-15%1972
Eastern Wood-PeweeTyrannidae32025-44%1972

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.